Safety lock for breech opening for firearms

ABSTRACT

Safety lock for insertion into the breech opening of a firearm comprising a lock member rotatably connected to a cylinder member, the lock member being received in the chamber of the breech block and rotated therein to a locked position by a key inserted into the cylinder member.

WMTTMT whee Johmmsson eK e10 SAFETY LUCK FUR BRIETEfiH OPENING IFOTT MREARMS 11nvemors: Lennmrfi .1. 11. Tehansson; Sven 1E.

Andersson, both of Eskiflstuna; 111m A. Efliasson, 11(atrineho1m, all of Sweden Assignee: Forenade T abrifimverhen, Eskilstune,

Sweden Filed: Mar. 27, 11972 Appl. No: 238,223

Foreign Application Pn'ority Dam 11 Th, T73

[56] ReTerences Cited UNITED STATES PATENTS 3,018,576 1/1962 Riechers 42/] N 3,089,272 5/1963 McKinlay 42/1 N 3,605,311 9/1971 Hermann 42/1 N Primary Examiner-Benjamin A. Borchelt Assistant ExaminerC. T. Jordan Attorney1Eric Y. Munson et a1.

[5 7] ABSTRACT Safety lock for insertion into the breech opening of a firearm comprising a lock member rotatably connected to a cylinder member, the lock member being received in the chamber of the breech block and rotated therein to a locked position by a key inserted into the cylinder member.

3 (11mins, 4 Drawing Figures Apr. 1, 1971 Sweden 4276/71 11.3. C1 412/11 M 1m. (IT T411111: 27/00, F410 27/08 Field of Search 4-2/1 N SAFETY LOCK FOR BREIECH OPENING FOR FIREARMS BACKGROUND OF THE INVENTION The invention relates a safety plug for firearms and the like which is inserted into the breech of the firearm to deactivate it and render it inoperable as a firearm.

One of the objects of the invention is to provide a safety lock of the type indicated which can easily be inserted into the breech of the firearm and be removed therefrom with equal facility and expedience by means of a key in possession of an authorized person.

Another object is to provide a safety lock for firearms which is retained in firm engagement with the breech chamber of the gun so as to make forcible removal therefrom impossible without damaging it to such an extent as to render it useless as a firearm.

A further object is to provide a safety breech plug which can be applied to conventional firearms without any modification thereof.

Further objects and advantages inherent in the invention will become apparent from the following description of a preferred embodiment and illustrated in the accompanying drawings,

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary longitudinal section of a firearm showing the safety lock according to the invention in locked position;

FIG. 2 is a section taken along the line IIII of FIG. 11;

FIG. 3 is a perspective view of the lock bolt according to the invention in unlocked position;

FIG. 4- is a perspective view showing the lock bolt in locked position.

DESCRIPTION OF A PREFERRED EMBODIMENT Referring to FIG. I of the drawing, the reference numeral indicates the breech receiver which is mounted on the gun stock ill. The barrel 12 is screwed into the forward end of the breech block 115.

The forward portion of the breech block is provided with an annular chamber 13, defined by the rear wall of the breech block and the rear surface of the barrel in which the breech bolt (not shown) is received upon injection of a shell into the chamber and retained therein in locked position by turning the bolt to cock the gun. The breech receiver also has a conventional opening 114 to which the cartridge magazine (not shown) may be connected and from which the shells or cartridges may be injected into the barrel.

The breech block 115 is provided with a conventional opening 116 for the breech bolt, the cross sectional configuration of which is shown in FIG. 2.

The device according to the invention comprises a lug or lock member 17 which is rotatably connected to the lock cylinder member 18. The lock memberl7 and the lock cylinder member l8 have substantially the same cross sectional configurations as the opening 16 so that they can be inserted therethrough and the lug 17 received in the annular chamber 13. The forward end portion 20 of the lock cylinder I9 is pivoted in the socket 21 of the lug 117 by means of the pin 22 which extends through the hole 23 in the lug l7 and the hole 24 in the lock cylinder 19.

The lock cylinder is of conventional design and comprises a tumbler including a plurality of lock discs 25 which are separated under spring-urged tension by means of springs 26. The lock bar 27 prevents rotation of the cylinder when the wrong key 29 is inserted into the key hole. The cylinder 19 is retained in the member 18 by the conventional ring 2%.

The cylinder member 18 is provided with a beveled shoulder 30 which engages and abuts against the beveled surface M at the bottom of the opening 16 of the breech block. Thus, the withdrawal of the lock plug l7, l8 through the forward end of the breech block will be prevented in the event the barrel I2 should be removed.

In order to prevent unauthorized use of the firearm, the breech bolt is first retracted or removed from the breech receiver whereupon the lock plug according to the invention is inserted through the opening 16 so as to locate the lug 17 within the chamber 113 with the lock cylinder member partially accommodated in the opening 116. The key 29 is then turned which operation causes each of the discs 25 to rotate a predetermined fraction of a revolution in accordance with the shape of the key. When the right key is inserted into the key hole, the conventional recesses on the periphery of the discs become aligned causing the lock bar 27 to drip into the recesses thereby unlocking the cylinder and permitting it to rotate as the key is turned another 90. The rotation of the lock cylinder causes the lug 17 to rotate 90 to abut against the surface 32 of the rear end of the barrel to become retained in locked position in the chamber 13. The foregoing operation is reversed for the removal of the lock plug.

Since the lock cylinder is of the conventional type, no detail illustration thereof is deemed necessary for the understanding of the invention. Furthermore it should be understood that any lock of the cylinder and tumbler type may be used without departing from the scope of the invention.

What is claimed:

l. A safety lock for insertion into a breech opening of a breech loading firearm having a breech receiver and a barrel and an annular chamber defined by a breech block and the rear surface of the barrel, comprising:

a. a lock member rotatably connected to a cylinder member; b. said members having a cross section corresponding substantially to the cross sectional configuration of the breech opening to permit insertion of said members into said breech opening and reception of said lock member into said annular chamber;

c. said lock member having a socket and said cylinder member having a portion of reduced diameter inserted into and pivoted in said socket to permit rotation of said lock member in the annular chamber into a locked position upon turning of said cylinder member.

2. A safety lock according to claim 11, in which said cylinder member is provided with a shoulder and said breech block has an abutment surface engaging said shoulder for limiting the inserting movement of the lock.

3. A safety lock according to claim 2, in which the lock member is rotated into locked position by a key inserted into said cylinder member. 

1. A safety lock for insertion into a breech opening of a breech loading firearm having a breech receiver and a barrel and an annular chamber defined by a breech block and the rear surface of the barrel, comprising: a. a lock member rotatably connected to a cylinder member; b. said members having a cross section corresponding substantially to the cross sectional configuration of the breech opening to permit insertion of said members into said breech opening and reception of said lock member into said annular chamber; c. said lock member having a socket and said cylinder member having a portion of reduced diameter inserted into and pivoted in said socket to permit rotation of said lock member in the annular chamber into a locked position upon turning of said cylinder member.
 2. A safety lock according to claim 1, in which said cylinder member is provided with a shoulder and said breech block has an abutment surface engaging said shoulder for limiting the inserting movement of the lock.
 3. A safety lock according to claim 2, in which the lock member is rotated into locked position by a key inserted into said cylinder member. 